Chess Megabase 2025 Updates 1 11 -both Formats- 7z Repack ❲Desktop❳

Introduction

For ChessBase 17 Users:

  1. Extract the 7z file to a temporary folder (e.g., C:\Temp\ChessUpdates).
  2. Open the CBH subfolder. Copy Megabase2025_Up11.cbh to your ChessBase directory.
  3. Do NOT merge blindly. Open ChessBase → Tools → Maintenance → Merge Databases.
  4. Select your original Megabase 2025 as the target. Select Up11.cbh as the source.
  5. Enable "Skip duplicates by FEN + ECO + Result" (crucial to avoid doubling).
  6. After merge, run "Compress Database" and "Re-index" .
  • Asking if it’s legitimate?
  • Looking for changelog details of update 1.11?
  • Having trouble extracting/using the files?

Where to Get Legitimate Copies

ChessBase Megabase 2025 (including updates) is a commercial product. Updates 1-11 are available to registered owners via: Chess Megabase 2025 Updates 1 11 -both Formats- 7z

  1. The Titled Tuesday Gold Pack: All 2,500 titled players’ blitz games from October & November 2025 are fully annotated in NAG (Numerical Annotation Glyphs) by the ChessBase AI bot "Cairo."
  2. Theoretical Novelties Index: A separate .txt file in the 7z lists 237 confirmed opening novelties played in 2025 (e.g., the “Bc5-d4 against the London System” seen in the U.S. Championship).
  3. Performance Stats for 2025: A .csv file containing Elo performance ratings for 12,000 active players—ideal for fantasy chess leagues or tournament seeding analysis.

Significance

The Chess Megabase 2025 Updates 1-11 are significant for several reasons: Introduction For ChessBase 17 Users: